Investments - Summary of Investment Portfolio (Detail) - USD ($)	Dec. 31, 2021		Dec. 31, 2020
Investment Holdings [Line Items]
Cost	$ 387,753,685	[1],[2]	$ 197,457,113	[3],[4]
Fair Value	$ 455,996,741	[1],[2]	$ 231,197,454	[3],[4]
Fair Value Percentage of Investment Portfolio	100.00%		100.00%
Fair Value Percentage of Net Assets	91.20%	[1],[2]	74.80%	[3],[4]
Total Senior Secured Notes
Investment Holdings [Line Items]
Cost	$ 152,542,454	[1],[2]	$ 78,042,454	[3],[4]
Fair Value	$ 152,542,454	[1],[2]	$ 78,042,454	[3],[4]
Fair Value Percentage of Investment Portfolio	33.50%		33.80%
Fair Value Percentage of Net Assets	30.50%		25.20%
First lien
Investment Holdings [Line Items]
Cost	$ 116,600,000	[1],[2]	$ 42,100,000	[3],[4]
Fair Value	$ 116,600,000	[1],[2]	$ 42,100,000	[3],[4]
Fair Value Percentage of Investment Portfolio	25.60%		18.20%
Fair Value Percentage of Net Assets	23.30%	[1],[2]	13.60%	[3],[4]
Second lien
Investment Holdings [Line Items]
Cost	$ 35,942,454	[1],[2]	$ 35,942,454	[3],[4]
Fair Value	$ 35,942,454	[1],[2]	$ 35,942,454	[3],[4]
Fair Value Percentage of Investment Portfolio	7.90%		15.60%
Fair Value Percentage of Net Assets	7.20%	[1],[2]	11.60%	[3],[4]
Equity
Investment Holdings [Line Items]
Cost	$ 235,211,231	[1],[2]	$ 119,414,659	[3],[4]
Fair Value	$ 303,454,287	[1],[2]	$ 153,155,000	[3],[4]
Fair Value Percentage of Investment Portfolio	66.50%		66.20%
Fair Value Percentage of Net Assets	60.70%	[1],[2]	49.60%	[3],[4]

[1] Percentages represent fair value as a percentage of net assets for each investment category.

[2] Security may be an obligation of one or more entities affiliated with the named company.

[3] Percentages represent fair value as a percentage of net assets for each investment category.

[4] Security may be an obligation of one or more entities affiliated with the named company.